AU2003299297B2

AU2003299297B2 - Profile for fitting a digger with a hoe bucket or loading shovel and method for production thereof

Info

Publication number: AU2003299297B2
Application number: AU2003299297A
Authority: AU
Inventors: Detlef Beckmann; Armin Grobenstieg
Original assignee: Terex Germany GmbH and Co KG
Current assignee: Terex Germany GmbH and Co KG
Priority date: 2002-12-06
Filing date: 2003-12-02
Publication date: 2009-09-10
Anticipated expiration: 2023-12-02
Also published as: AU2003299297A1; CA2507593A1; US7814730B2; DE10257041B3; CA2507593C; EP1567728B1; US20060021264A1; CN100465391C; EP1567728A1; DE50311694D1; ZA200504093B; CN1720376A; WO2004053241A1

Description

I Profile for fitting a digger with a hoe bucket or loading shovel and method for production thereof Technical Field 5 The invention concerns a welded section for hoe buckets and loading shovels of a digger, such as booms and stanchions. Background Art From US 4,034,876 a boom construction for a hydraulic digger and a method to 10 produce the boom is known. The boom has a curved external contour and has an upper and lower web as well as two side walls provided between them. The wall regions have reduced cross-sections both on the upper and lower webs, while in the interior further reinforcing support elements are provided. To accommodate the mounting points for the cylinders, separate bearing regions are welded on in the region of the upper web. 15 Due to this type of welded joints undesirable local stresses are produced in highly stressed regions. A similar construction becomes apparent from JP-A 11 021 939, wherein between the upper and lower webs with thickened end regions side walls with reduced cross-section 20 are used. A further cross-section of a boom of a digger becomes apparent from JP-A 200 102 0311. The upper and lower webs as well as the side walls are welded between the individual corner regions. 25 In DE-A 198 82 547 the boom of a loading shovel and the manufacturing methods for same are discussed. The boom has the shape of a boomerang, while the carrier end of the boom is mounted on the superstructure of a vehicle and an arm is provided on the front end of the boom. The body of the boom is hollow and has a triangular cross 30 section.

2 In the US 2,984,373 a vehicle is described, on which a digger is mounted. The telescoping boom has a square cross-section, while the upper and lower web as well as the side walls provided between them are approximately the same thickness. 5 A vehicle is known also from US 4,257,201, on which a telescoping crane boom is mounted. To accommodate sliding bodies the joining regions of the side walls and of the upper web have thickenings with profiled sections, in the region of which their upper web and the side walls are fastened. Between the lower web and the side walls thickened joining elements extend. 10 Summary of the Invention The present invention concerns a welded section for hoe buckets and loading shovels of a digger, such as booms and stanchions, the welded section comprising an upper web and a lower web as well as side walls effectively joined with them, characterised in that 15 the side walls are provided with upper and lower end regions with reinforced sections which form the corner regions for the upper web and lower web provided between the end regions, wherein the end regions are formed with separate plates which are adapted to the respective contour of the boom and the stanchion, said plates joined by welding to the respective side walls with a thinner cross-section, and the side walls are joined to 20 the reinforced section end regions which are provided with bearing positions to accommodate mounting points for cylinders. It is an advantage of at least one embodiment of the invention in that a welded section for hoe buckets and loading shovels is developed in such a manner, that it will result in 25 a stress reduction in the highly stressed local areas. By this construction of the section the welding seams will be shifted to the region of lower stresses, so that the notch effect of the welding seams will be less significant, leading ultimately to an increase of the service lives of the components. 30 In the case of a method to produce a welded section for hoe buckets and loading shovels of a digger, like booms and stanchions, wherein the lower and upper webs are 3 joined with the side wall regions by welding, the invention proposes to join the side walls with the upper and lower end regions having reinforced sections, particularly by welding, to place the lower web between the associated end regions and join them by welding and to position the upper web between the associated end regions and join 5 them by welding, and to so construct the contour of the end regions alternatively on the side of the upper and lower webs that they from integrated mounting regions for the mounting points of the cylinders. By constructing the section according to the invention the welding seams will be 10 shifted to the regions of lower stresses, so that the notch effect of the welding seams can be considerably reduced. By this act an increase of the service lives of the components, in particular of the booms and stanchions of diggers, particularly of hydraulic diggers, can be achieved. The application of the subject matter of the invention is of particular interest for heavy duty hydraulic diggers, like those used in 15 mining operations. Such equipment is used in the most difficult terrain, while material fatigue becomes noticeable in a cost-intensive manner, because when damages occur the digger becomes non-operational for a long period. In a manner different from the state-of-the-art, the upper and lower webs of the 20 suggested section are placed between the side walls, in particular their end regions with the thickened section, and joined by welding. Similarly to the side walls, the respective end regions with the reinforced material cross-section, are constructed corresponding to the respective contour of the boom and 25 the stanchion, and joined by welding. A further advantage of the proposed section is that by integrating the mounting points for the cylinders and the hydraulic unit in the end regions with the reinforced section on the side of the upper or lower web, alternatively, all welding seams used currently can 30 be omitted.

4 As far as production technology is concerned, a simplified construction of the components is possible without assembly fixtures. Brief Description of the Drawings 5 The subject matter of the invention is illustrated in the drawing based on an embodiment and is described below. It shows in: Fig.1 - a sketch of the principle of a hydraulic digger fitted with a hoe bucket, Fig.2 - a sketch of the principle of a hydraulic digger fitted with a loading shovel, Fig.3 - partial illustration of a boom according to Fig.1 or 2, 10 Figs.4 to 8 - cross-sections through the boom according to Fig.3 with various reinforced end sections. Description of the Preferred Embodiment Fig.1 shows a hydraulic digger 1, comprising a superstructure 2 as well as an 15 undercarriage 4 with caterpillar drive 3. In this example the hydraulic digger I has a hoe bucket 5, comprising a boom 6 and a stanchion 7, as well as a scoop 8. The boom 6 is mounted on the superstructure 2 via a hydraulic cylinder 9. A further hydraulic cylinder 10 extends between a mounting section 11 that is welded to the boom 6 and one end 12 of the stanchion. A further hydraulic cylinder 13 extends between a 20 mounting point 14 on the stanchion and a mounting region 15 on the side of the bucket, that itakes the form of a lever arm. Fig.2 shows a sketch of the principle of a hydraulic digger 1' with a loading shovel 5'. The essential components of the loading shovel 5' are the boom 6', the stanchion 7' as 25 well as the shovel 8'. Fig.3 shows the boom 6, shown in principle in Fig. 1, which comprises the features according to the invention. The boom 6 is provided with a lower web 16, an upper web 17, side walls 18 as well as upper and lower end regions 19, 20 with reinforced 30 sections. The following figures illustrate in detail that the parallel extending side walls 18 are welded to the upper and lower reinforced profile end regions 19, 20 which form 5 the corner regions for the upper web 17 and the lower web 16 arranged between the end regions 19, 20. According to the invention the contour for the separate section 11, illustrated in Fig.1, matches the contour of the reinforced profile end regions 19 on the side of the upper web (integrated mounting regions 11'), so that as a result of the 5 integration of the mounting point 21 for the cylinder 10 and mounting point 21' for the cylinder 9 illustrated in Fig.l (not illustrated in this case), all welding seams, present until now in these positions, become redundant. The base bearing 22 is shaped to match the cross-section of the booms 6 and 6' in the joining region 23 and joined with the boom by welding. The same is valid for the fork-shaped attachment region 24 for the 10 stanchion 7 (not illustrated here) according to Fig. 1. The bearing region 21', provided in the side walls 18, serves the purpose of accommodating one end of the hydraulic cylinder 9, illustrated in Fig. 1. Figs.4 to 8 show various cross-sections of booms 6, as they are illustrated, for example, 15 in Fig.3 the following components can be recognised: the lower web 16, the upper web 17, the side walls 18, the lower end region 20 with the reinforced profile, as well as the bearing regions 21 which are integrated in the reinforced upper end regions 19. In the region of the joining areas 25, 26 the side walls 18 are welded to the reinforced end regions 19, 20 with a wider reinforced profile cross-section in the region of the joining 20 areas 25, 26. The differences between the Figs.4 to 8 can be seen in that the end regions with the reinforced profile are provided with cross-section reduced regions 27, 28 such that they sit flush on the outside, on the inside or centred, resulting in a box-shaped section in 25 one case with a smooth internal contour 29 (Fig.5), in another case with a smooth external contour 30 (Fig.4) as well as with side walls 18 attached centrally to the end regions 19, 20 with the reinforced profiles (Fig.6). The person skilled in the art will use that contour which is suitable for the task. In all cases the lower web 16 ends flush with the associated end region 20. The upper web 17 is placed between the respective end 30 regions 19 and is welded thereto in the same way as the lower web.

6 In Fig.7 alternatively constructed regions 27, 28 are illustrated with their cross-sections reduced. The mounting point 21 for the cylinder 10 and the mounting point 21' for the cylinder 9 (not visible in this case) of Fig. I are integrated in the mounting region 1 ', whereas in the other figures they protrude past the outside contours. An essentially 5 polygonal internal contour 31 is produced, which has smooth external contours 30. Fig.8 shows a combination of the regions 27, 28 with reduced cross-sections, as can be obtained from Figs.4 and 6. 10 In all cases, the joining of the upper web 17 and the lower web 16 are connected in the end regions 19, 20 that is the region of wider cross-section. By virtue of the construction of the section, the welding seams are shifted to the region of lower stresses, while the notch effect of the welding seams is reduced, leading to a not insignificant increase of the service lives of the components. 15 There is the alternative possibility so to construct the contour of the end regions 20 on the side of the lower web, that they will form integrated accommodation regions for the mounting points for the cylinders. This would be a version of those illustrated in Figs.4 to 8, but rotated by 1800. The person skilled in the art would be able to adapt the 20 necessary construction to suit the relevant digger type in this case also.

Claims

1. A welded section for fitting a digger (1) with a hoe bucket (5) or loading shovels (5') such as booms (6, 6') and stanchions (7, 7'), the welded section comprising an upper 5 web (17) and a lower web (16) as well as side walls effectively joined with them, characterised in that the side walls each comprise a thinner side wall (18) provided with upper and lower end regions (19, 20) with reinforced sections which form the corner regions for the upper web (17) and lower web (16) provided between the end regions (19, 20), wherein the end regions (19, 20) are formed with separate plates which are 10 adapted to the respective contour of the boom (6, 6') and the stanchion (7, 7'), said plates joined by welding to the respective side walls (18) with a thinner cross-section, and the side walls (18) are joined to the reinforced section end regions (19, 20) which are provided with bearing positions to accommodate mounting points (21) for cylinders (10). 15

2. A welded section according to claim 1, characterised in that at least the lower web (16) is positioned between the end regions (20) closing off essentially flush the respective end regions (20). 20

3. A welded section according to any one of the claims I to 2, characterised in that the end regions (19, 20) are providing having regions (27, 28) with at least partially reduced cross-sections.

4. A welded section according to any one of claims I to 3, characterised in that the 25 regions (27, 28) with the reduced cross-section face the respective side wall (18).

5. A welded section according to any one of claims I to 4, characterised in that the respective region (27, 28) with the reduced cross-section ends flush with the internal contour (29) of the associated side wall (18). 30 8

6. A welded section according to any one of claims I to 5, characterised in that the respective region (27, 28) with the reduced cross-section ends flush with the external contour (30) of the associated side wall (18). 5

7. A welded section according to any one of claims 1 to 6, characterised in that the respective region (27, 28) with the reduced cross-section is central relative the internal and external contour of the associated side wall (18).

8. A welded section according to any one of the claims I or 7, characterised in that 10 the contour of the end regions (19) on the side of the upper web is so formed, that they are used to accommodate the mounting points (21) for cylinders (10).

9. A welded section according to any one of claims 1 to 8, characterised in that attachment elements (22, 24) are joinable by welding on in the region of an exposed 15 section end, formed with a hollow box design, wherein the cross-section of the attachment elements is adapted to the respective end cross-section of the box.

10. A method to produce a welded section for hoe buckets and loading shovels of a digger, such as booms and stanchions, by welding an upper web and a lower web to 20 side walls, characterised in that the side walls (18) are joined by welding to upper and lower reinforced section end regions (19, 20) that the lower web (16) is placed between the associated end regions (20) and joined to them by welding, and that the upper web (17) is placed between the associated end regions (19) and joined to them by welding, and that the end regions (19) on the side of the upper web or lower web are so formed 25 with contours that they form integrated regions (I ') for mounting points (21) for cylinders (10).

11. A method according to claim 10, characterised in that the side walls (18) and the associated end regions (19, 20) are formed to correspond to the contour of the 30 respective boom (6, 6') and stanchion (7, 7) and that the end regions (19, 20) are 9 constructed thicker than the side walls (18) which are provided with reduced cross sections.

12. A method according to one of claims 10 or 11, characterised in that the contours 5 of the end regions (20) on the side of the lower web are so formed that they form integrated mounting regions for the mounting points for the cylinders.

13. A welded section for hoe buckets (5) and loading shovels (5') of a digger, substantially as hereinbefore described with reference to the accompanying drawings. 10

14. A method to produce a welded section for hoe buckets (5) and loading shovels (5') of a digger, substantially as hereinbefore described with reference to the accompanying drawings.